Install Munin on Centos 5.5

wget http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm
rpm -Uvh epel-release-5-4.noarch.rpm
yum install munin munin-common munin-node
/etc/init.d/munin-node start

vi /etc/munin/munin.conf 
# dbdir   /var/lib/munin 
# htmldir /var/www/html/munin
# logdir  /var/log/munin 
# rundir  /var/run/munin 

# Where to look for the HTML templates 
tmpldir /etc/munin/templates

chown munin:munin /var/www/html/munin
/etc/init.d/munin-node restart

# open http://{$IPAddr}/munin

Reference: http://smallken.no-ip.org/blog/2008/12/28/linux/1004.html